Role of spacer lengths of gemini surfactants in the synthesis of silver nanorods in micellar media

Abstract

In this work, we have prepared Ag-nanorods using biscationic gemini surfactant micelles as the media by a seed-mediated wet synthesis method. Towards this end, we first synthesized Ag-nanoseeds of diameter ~7 nm stabilized by trisodium citrate (as the capping agent). Then these Ag-nanoseeds were used to synthesize Ag-nanorods of different aspect ratios. With decreasing Ag-nanoseed concentration, the aspect ratios of the Ag-nanorods stabilized by these gemini surfactants increased gradually. Various Ag-nanoseeds and Ag-nanospecies were characterized using UV-Vis spectroscopy (to know the surface plasmon bands), transmission electron microscopy (to find out their particle sizes and distribution), energy-dispersive X-ray spectroscopy and X-ray diffraction. When we used micelles derived from gemini surfactants of shorter spacer -(CH(2))(n)- (n = 2 or 4) to stabilize the Ag-nanorods, the λ(max) of the longitudinal band shifted more towards the blue region compared to that of the gemini surfactant micelles with a longer spacer -(CH(2))(n)- (n = 5, 12) at a given amount of the Ag-nanoseed solution. So, the growth of Ag-nanorods in the gemini micellar solutions depends on the spacer-chain length of gemini surfactants employed.

Synergism between anionic double tail and zwitterionic single tail surfactants in the formation of mixed micelles and vesicles, and use of the micelle templates for the synthesis of nano-structured gold particles

“…From the seed-mediated synthesis of Ag-nanorods in the geminies Bhattacharya and Biswas [67] observed that the growth of the rods which was inversely proportional to the length of spacer. Das et al [71] reported the role of the SDS micelles in the formation of the GNPs in aqueous solution.…”

“…Surfactants can play an important role in the synthesis and stabilization of metal nanoparticles (NP); they can as well control the size and shape of the NPs depending on their types and lengths [67][68][69][70][71][72]. Cationic surfactants have potential effect on the above process.…”

Study on metal nanoparticles synthesis and orientation of gemini surfactant molecules used as stabilizer

“…In addition, ammonium based gemini surfactants have remarkable role in aggregation and displaying rate acceleration involving in chemical reactions as compared to the conventional single chainsingle headgroup surfactants [9][10][11][12][13][14]. It is already known that the spacer group of the gemini surfactant plays an important role for the synthesis of Au and Ag nanoparticles (NPs) and significantly controls their size and shape [9,10,15].…”

“…It is already known that the spacer group of the gemini surfactant plays an important role for the synthesis of Au and Ag nanoparticles (NPs) and significantly controls their size and shape [9,10,15]. Yao and co-workers [10] have reported the formation of well separated spherical Au-NPs of different size in aqueous medium using alkanediyl-a,x-bis http://dx.doi.org/10.1016/j.jcis.2014.12.064 0021-9797/Ó 2014 Elsevier Inc. All rights reserved.…”

Synthesis of stable iron oxide nanoparticle dispersions in high ionic media

“…For instance, usually surfactants prefer to attach on the (100) facet rather than (111) facet, which leads to an ordered anisotropic growth to produce nanorods particle [39,40]. Crystallography of Fe3O4 naanoparticles are inverse-spinel crystal with face-centered cubic, structures (Fd3m space group) [41].…”